func parseLabeledValue(txt string) (label, value string, eatLen int) {
feed := txt
if idx := strings.IndexFunc(txt, oxm.IsSeparator); idx > 0 {
feed = txt[:idx]
}
trail := []rune{}
for _, c := range txt[len(feed):] {
if oxm.IsSeparator(c) {
trail = append(trail, c)
} else {
break
}
}
kv := strings.SplitN(feed, "=", 2)
if len(kv) > 1 {
return kv[0], kv[1], len(feed) + len(string(trail))
} else {
return kv[0], "", len(feed) + len(string(trail))
}
}
func (self *flowRule) Parse(txt string) error {
var actions []byte
var delayed func() = nil
phase := PHASE_MATCH
for len(txt) > 0 {
// in case value would include separator, don't use these value and just recalculate
label, value, step := parseLabeledValue(txt)
if label[0] == '@' && delayed != nil {
delayed()
delayed = nil
}
switch label {
case "@meter":
phase = PHASE_METER
var meterId uint32
if err := parseInt(value, &meterId); err != nil {
return err
}
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_METER)
binary.BigEndian.PutUint16(inst[2:], 8)
binary.BigEndian.PutUint32(inst[4:], meterId)
self.Instructions = append(self.Instructions, inst[:]...)
case "@apply", "@apply_actions":
phase = PHASE_APPLY
delayed = func() {
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_APPLY_ACTIONS)
binary.BigEndian.PutUint16(inst[2:], uint16(len(actions)+8))
self.Instructions = append(self.Instructions, inst[:]...)
self.Instructions = append(self.Instructions, actions...)
actions = actions[:0]
}
case "@clear", "@clear_actions":
phase = PHASE_CLEAR
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_CLEAR_ACTIONS)
binary.BigEndian.PutUint16(inst[2:], 8)
self.Instructions = append(self.Instructions, inst[:]...)
case "@write", "@write_actions":
phase = PHASE_WRITE
delayed = func() {
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_WRITE_ACTIONS)
binary.BigEndian.PutUint16(inst[2:], uint16(len(actions)+8))
self.Instructions = append(self.Instructions, inst[:]...)
self.Instructions = append(self.Instructions, actions...)
actions = actions[:0]
}
case "@metadata", "@write_metadata":
phase = PHASE_META
var v, m uint64
vm := strings.SplitN(value, "/", 2)
if err := parseInt(vm[0], &v); err != nil {
return err
}
if len(vm) == 2 {
if err := parseInt(vm[1], &m); err != nil {
return err
}
} else {
m = 0xFFFFFFFFFFFFFFFF
}
var inst [24]byte
binary.BigEndian.PutUint16(inst[0:], OFPIT_WRITE_METADATA)
binary.BigEndian.PutUint16(inst[2:], 24)
binary.BigEndian.PutUint64(inst[8:], v)
binary.BigEndian.PutUint64(inst[16:], m)
self.Instructions = append(self.Instructions, inst[:]...)
case "@goto", "@goto_table":
phase = PHASE_GOTO
var tableId uint8
if err := parseInt(value, &tableId); err != nil {
return err
}
var inst [8]byte
binary.BigEndian.PutUint16(inst[:], OFPIT_GOTO_TABLE)
binary.BigEndian.PutUint16(inst[2:], uint16(len(inst)))
inst[4] = tableId
self.Instructions = append(self.Instructions, inst[:]...)
default:
switch phase {
case PHASE_MATCH:
switch label {
case "table":
var v uint8
if err := parseInt(value, &v); err != nil {
return err
}
self.TableId = v
case "priority", "idle_timeout", "hard_timeout":
var v uint16
if err := parseInt(value, &v); err != nil {
return err
}
switch label {
case "idle_timeout":
self.IdleTimeout = v
case "hard_timeout":
self.HardTimeout = v
case "priority":
self.Priority = v
}
case "cookie":
var v, m uint64
vm := strings.SplitN(value, "/", 2)
if err := parseInt(vm[0], &v); err != nil {
return err
}
if len(vm) == 2 {
if err := parseInt(vm[1], &m); err != nil {
return err
}
}
self.Cookie = v
self.CookieMask = m
case "out_port":
var v uint32
if err := parseInt(value, &v); err != nil {
return err
}
self.OutPort = v
case "out_group", "group":
var v uint32
if err := parseInt(value, &v); err != nil {
return err
}
self.OutGroup = v
default:
if buf, n, err := oxm.ParseOne(txt); err != nil {
return err
} else {
self.Match = append(self.Match, buf...)
step = n
}
}
case PHASE_APPLY, PHASE_WRITE:
if buf, n, err := ParseAction(txt); err != nil {
break
} else {
actions = append(actions, buf...)
step = n
}
}
}
for i, c := range txt[step:] {
if !oxm.IsSeparator(c) {
step += i
break
}
}
txt = txt[step:]
}
if delayed != nil {
delayed()
}
return nil
}